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Posted to dev@pig.apache.org by "Rohini Palaniswamy (JIRA)" <ji...@apache.org> on 2014/09/11 03:20:34 UTC

[jira] [Created] (PIG-4165) Rework Hash based aggregation for Tez

Rohini Palaniswamy created PIG-4165:
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             Summary: Rework Hash based aggregation for Tez
                 Key: PIG-4165
                 URL: https://issues.apache.org/jira/browse/PIG-4165
             Project: Pig
          Issue Type: Sub-task
            Reporter: Rohini Palaniswamy


pig.exec.mapPartAgg (https://wiki.apache.org/pig/PigHashBasedAggInMap) is currently only used for group by if there is any aggregation to be done. In Tez, should enable hash based grouping for normal and skewed joins, groupby with or without aggregation on the map side. This will play well with the IFile optimizations done and support for writing key and list of values (TEZ-1260) and reduce the sorting time on the map side.



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